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  • 2000-2004  (18)
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  • 1
    Electronic Resource
    Electronic Resource
    High-latitude influence on the eastern equatorial Pacific climate in the early Pleistocene epoch (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 427 (2004), S. 720-723 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many records of tropical sea surface temperature and marine productivity exhibit cycles of 23 kyr (orbital precession) and 100 kyr during the past 0.5 Myr (refs 1–5), whereas high-latitude sea surface temperature records display much more pronounced ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02338
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    Paper (German National Licenses)
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  • 2
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    Age and alkenone-derived Holocene sea-surface temperature records of sediment core LPAZ-021PG (2001)
    PANGAEA
    Details
    Publication Date: 2023-11-25
    Keywords: AGE; Calculated from UK'37 (Prahl et al., 1988); DEPTH, sediment/rock; GC; Gravity corer; LPAZ; LPAZ-021PG; Sea surface temperature, annual mean; Spencer F. Baird
    Type: Dataset
    Format: text/tab-separated-values, 13 data points
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  • 3
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    High-resolution sedimentological and paleontological record of ODP Site 167-1019 (2003)
    PANGAEA
    In:  Supplement to: Barron, John A; Heusser, Linda E; Herbert, Timothy D; Lyle, Mitchell W (2003): High resolution climatic evolution of coastal Northern California during the past 16,000 Years. Paleoceanography, 18(1), 1020, https://doi.org/10.1029/2002PA000768
    Details
    Publication Date: 2024-01-09
    Description: Holocene and latest Pleistocene oceanographic conditions and the coastal climate of northern California have varied greatly, based upon high-resolution studies (ca. every 100 years) of diatoms, alkenones, pollen, CaCO3%, and total organic carbon at Ocean Drilling Program (ODP) Site 1019 (41.682°N, 124.930°W, 980 m water depth). Marine climate proxies (alkenone sea surface temperatures [SSTs] and CaCO3%) behaved remarkably like the Greenland Ice Sheet Project (GISP)-2 oxygen isotope record during the Bølling-Allerod, Younger Dryas (YD), and early part of the Holocene. During the YD, alkenone SSTs decreased by 〉3°C below mean Bølling-Allerod and Holocene SSTs. The early Holocene (ca. 11.6 to 8.2 ka) was a time of generally warm conditions and moderate CaCO3 content (generally 〉4%). The middle part of the Holocene (ca. 8.2 to 3.2 ka) was marked by alkenone SSTs that were consistently 1-2°C cooler than either the earlier or later parts of the Holocene, by greatly reduced numbers of the gyre-diatom Pseudoeunotia doliolus (〈10%), and by a permanent drop in CaCO3% to 〈3%. Starting at ca. 5.2 ka, coastal redwood and alder began a steady rise, arguing for increasing effective moisture and the development of the north coast temperate rain forest. At ca. 3.2 ka, a permanent ca. 1°C increase in alkenone SST and a threefold increase in P. doliolus signaled a warming of fall and winter SSTs. Intensified (higher amplitude and more frequent) cycles of pine pollen alternating with increased alder and redwood pollen are evidence that rapid changes in effective moisture and seasonal temperature (enhanced El Niño-Southern Oscillation [ENSO] cycles) have characterized the Site 1019 record since about 3.5 ka.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 4
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    Holocene sea-surface reconstructions for the Californian margin (2001)
    PANGAEA
    In:  Supplement to: Herbert, Timothy D; Schuffert, Jeffrey D; Andreasen, Dyke; Heusser, Linda E; Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Stott, Lowell D; Herguera, Juan-Carlos (2001): Collapse of the California current during glacial maxima linked to climate change on land. Science, 293(5527), 71-76, https://doi.org/10.1126/science.1059209
    Details
    Publication Date: 2024-01-09
    Description: Time series of alkenone unsaturation indices gathered along the California margin reveal large (4° to 8°C) glacial-interglacial changes in sea surface temperature (SST) over the past 550,000 years. Interglacial times with SSTs equal to or exceeding that of the Holocene contain peak abundances in the pollen of redwood, the distinctive component of the temperate rainforest of the northwest coast of California. In the region now dominated by the California Current, SSTs warmed 10,000 to 15,000 years in advance of deglaciation at each of the past five glacial maxima. SSTs did not rise in advance of deglaciation south of the modern California Current front. Glacial warming along the California margin therefore is a regional signal of the weakening of the California Current during times when large ice sheets reorganized wind systems over the North Pacific. Both the timing and magnitude of the SST estimates suggest that the Devils Hole (Nevada) calcite record represents regional but not global paleotemperatures, and hence does not pose a fundamental challenge to the orbital ("Milankovitch") theory of the Ice Ages.
    Keywords: 167-1012B; DRILL; Drilling/drill rig; GC; Gravity corer; Joides Resolution; Leg167; LPAZ; LPAZ-021PG; North Pacific Ocean; Ocean Drilling Program; ODP; Spencer F. Baird
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 5
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    (Table 1) Results of alkenone analyses of ODP Hole 165-1002C (2000)
    PANGAEA
    In:  Supplement to: Herbert, Timothy D; Schuffert, Jeffrey D (2000): Alkenone unsaturation estimates of sea-surface temperatures at site 1002 over a full glacial cycle. In: Leckie, RM; Sigurdsson, H; Acton, GD; Draper, G (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 165, 1-9, https://doi.org/10.2973/odp.proc.sr.165.030.2000
    Details
    Publication Date: 2024-01-09
    Description: We determined alkenone concentrations (µg/g dry sediment) and unsaturation indices (Uk'37) on 280 samples from Ocean Drilling Program Hole 1002C over the last full glacial cycle (marine oxygen isotope Stages [MIS] 1-6). Alkenone concentrations vary dramatically in relation to glacial-interglacial cycles, with high concentrations typical of interglacial stages, high sea level, inferred high surface productivity, and bottom-water anoxia. Our reconstruction of low productivity during the last glacial maximum is consistent with previous reports of a sharp decline in the foraminiferal species Neogloboquadrina dutertrei, an upwelling index. Alkenone paleotemperatures show little cooling at both the last glacial maximum and MIS 6. Variations of as much as 4°C occurred during the earlier part of MIS 3 and MIS 4 as well as the latter part of MIS 5. The absence of cooling during glacial maxima determined from alkenone paleothermometry is consistent with faunal reconstructions for the western Caribbean but requires that much of the oxygen isotopic record of the planktonic foraminifer Globigerinoides ruber be influenced by salinity variations rather than temperature.
    Keywords: 165-1002C; AGE; Alkenone, C37:3+C37:2; Alkenone, unsaturation index UK'37; Calculated from UK'37 (Prahl et al., 1988); Cayman Rise, Caribbean Sea; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg165; Ocean Drilling Program; ODP; Sample code/label; Sea surface temperature, annual mean; see reference(s)
    Type: Dataset
    Format: text/tab-separated-values, 1118 data points
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  • 6
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    (Table S2) Alkenone unsaturation index and SST reconstruction for ODP Hole 167-1019C (2003)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 167-1019C; AGE; Alkenone, C37; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Joides Resolution; Leg167; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Sea surface temperature, annual mean; SST, from UK'37
    Type: Dataset
    Format: text/tab-separated-values, 384 data points
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  • 7
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    (Table 1) Age determination of ODP Site 167-1019 (2003)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 167-1019A; 167-1019D; Age, 14C AMS; Age, 14C calibrated, CALIB 4.3 (Stuiver et al., 1998); Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg167; North Pacific Ocean; Ocean Drilling Program; ODP; Reservoir age; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 180 data points
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  • 8
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    (Table S3) Sediment composition of ODP Hole 167-1019C (2003)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 167-1019C; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, total organic carbon; AGE; Calcium carbonate; Calculated; Carbon, organic, total; Density, dry bulk; Density, wet bulk; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Estimated; Gamma-ray attenuation porosity evaluator (GRAPE); Joides Resolution; Leg167; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 1422 data points
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  • 9
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    (Table S4) Diatom assemblages of ODP Hole 167-1019C (2003)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 167-1019C; Actinocyclus curvatulus; Actinoptychus spp.; AGE; Azpeitia nodulifer; Azpeitia tabularis; Chaetoceros spores; Coscinodiscus radiatus; Delphineis spp.; DEPTH, sediment/rock; Diatoms; Diatoms, benthic; Diatoms, freshwater; Diatoms, planktic; Diatoms, reworked; Diatoms indeterminata; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Hemidiscus cuneiformis; Joides Resolution; Leg167; Neodenticula seminae; Nitzschia interruptestriata; Nitzschia sp.; North Pacific Ocean; Ocean Drilling Program; ODP; Paralia sulcata; Pseudoeunotia doliolus; Rhizosolenia spp.; Roperia tesselata; Sample code/label; Stephanopyxis spp.; Thalassionema nitzschioides; Thalassiosira eccentrica; Thalassiosira oestrupii; Thalassiosira pacifica; Thalassiosira spp.; Thalassiothrix longissima
    Type: Dataset
    Format: text/tab-separated-values, 3090 data points
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  • 10
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    (Table 1) Age determination of sediment core PC17 (2001)
    PANGAEA
    In:  Supplement to: Lee, Kyung Eun; Slowey, Niall C; Herbert, Timothy D (2001): Glacial sea surface temperatures in the subtropical North Pacific: A comparison of UK'37, d18O, and foraminiferal assemblage temperature estimates. Paleoceanography, 16(3), 268-279, https://doi.org/10.1029/1999PA000493
    Details
    Publication Date: 2024-03-09
    Description: We have investigated glacial-interglacial differences in sea surface temperature (SST) near Hawaii using two relatively high deposition rate, shallow-water piston cores collected near Oahu, Hawaii. Modern hydrographic data show that local surface water temperatures are broadly consistent with the regional pattern of SSTs in the southern subtropical North Pacific. Past SSTs were estimated on the basis of three independently measured parameters: (1) UK'37 values of alkenones, (2) d18O of Globigerinoides ruber, and (3) assemblages of planktonic foraminifera using the modern analog technique (MAT). The two cores yield similar SST records, and if differences in the ecology of foraminifera and coccolithophores are considered, the three different approaches to estimating SSTs yield consistent results. UK'37-based temperatures, which may represent winter values at this location, were ~2.5°C colder during the Last Glacial Maximum than today, which is consistent with the February MAT estimates. The d18O-based temperature estimates, likely biased toward summer temperatures, indicate that the glacial SSTs were at least 1°C cooler than today, which is comparable to the results of MAT August estimates.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Laboratory code/label; Pacific/off Hawaii; PC; PC17; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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